Power supply for radio receiving sets



p 5, 1931- O H. 5. DE MALAUSSENE 1,823,592

POWER SUPPLY FOR RADIO RECEIVING SETS Filed Nov. 24, 1926 I Q a a i? Q w & g

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Patented Sept. 15, 1931 NITED STATES PATENT OFFICE HENRI S. DE MALAUSSENE, OF LOS ANGELES, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO A. I4. IBERNHEIMER, OF SANTA MONICA, CALIFORNIA POWER SUPPLY FOR RADIO RECEIVING SETS Application filed November 24, 1926. Serial No. 150,535.

My invention relates to radio receiving sets and has for its principal objects the provision of a relatively simple, practical and efiicient apparatus or system that will eliminate the A, B and C batteries now generally used for radio reception and which improved system utilizes ordinary commercial electricity such as is supplied to household lighting systems.

A further object of my invention is to provide a radio battery eliminating system wherein the objectionable humming noises that usually attend the use of alternating current in radio receiving sets is entirely eliminated.

A still further object of my invention is to provide a radio battery eliminating system that is very compact, dependable in operation and results, and which is inexpensive of manufacture, due to the absence of specially formed parts.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that will be hereinafter more fully described and claimed and illustrated in the accompanying drawing in which The figure is a diagrammatic view of a. ra-

' dio battery eliminating system embodying the principles of my invention.

Briefly stated, myimproved battery eliminating system consists of four connected sections or units, the first of which is the power transformer that receives the requisite power force from a suitable source of supply, for instance, the ordinary household lighting circuit and which power or current is stepped up to the value that is required by the radio receiver plus such additional amount of power as is necessary to overcome the losses inherent in the transformer, the rectifier and the filter.

Directly connected to the transformer is the second unit or section of the apparatus, namely the rectifying means, which converts the alternating current into a direct current of an In the latter state, the direct current cannot be applied to the receiver owing to the hum that drowns out all but the strongestsignals. Therefore, a third or filtering section or unit is utilized in order to produce a smooth, continuous direct current. The voltage of the continuous, direct current flowing from the filtering unit is considerably in excess of that required for the operation of radio receiving sets. Therefore it is necessary to utilize in the system a fourth unit or section and which functions as a voltage regulator. This regulator consisting of various resistances and condensers, is employed to cut down the high voltage wherever necessary and to produce the requisite values for the detector and radio frequency amplifier tube and the C grid of the receiving set.

The transformer section of the system contains a low voltage winding that is capable of supplying 8 volts at one ampere or more, for filament lighting purposes and a high voltage secondary winding is provided to supply the rectifier tube which must deliver 220 v0 ts The antenna effect and ground are taken from the source of supply or household lighting circuit with a specially designed plug.

Referring by numerals to the accompanying drawing, 10 designates the primary winding of a transformer having a laminated core 11 and said primary winding being connect ed bysuitable conductors 12 to a suitable source of supply, preferably a household lighting circuit of 110 volts A. 0. Connected to the conductors 12 that lead to the primary winding 10, are conductors 13 and 14 and which latter lead respectively to the an tenna and ground posts 15 and 16 of the receiving set. Each of the conductors l3 and 14 is cut to form-a narrow gap and located inthe gaps between the ends of said conductors are sections 17 of mica.

The numeral 18 designates the secondary winding of the transformer and leading from one side or leg to a choke coil 19, is a conductor 20. The opposite side of leg of the secondary coil 18 is connected by a conductor 21 to the filament 22 of a rectifying tube 23.

It will be understood that the 110 volt current passing through the transformer and from primary winding 10 to secondary winding 18 is stepped up to 220 volts, and that this current, after passing through choke coil 19 becomes B+ of the eliminator. From the other side or leg of secondary coil 18 through rectifying tube 23 and plate 24 therein and conductor 25 leading from said plate, the negative, or C of the eliminator is obtained. This being the most negative conductor in the system.

Wound directly upon secondary winding 18, is a third winding 26, which by induction, receives sufficient current to light the filament 22 of the rectifying tube 23, this coil having sufiicient windings to produce a 6 volt output. One side of this winding 26 is connected to one side of the filament 22 and the other side of the winding is connected to conductor 21 that leads to the other side of the filament.

The maximum B potential is obtained from conductor 33. The resistance 35 connected at one end to conductor 33, reduces the B potential obtainable at an intermediate terminal to which the other end of the resistance is connected. Conductor 37 which provides the B- and (3+ supply is connected to conductor 25 through a resistance 38 across which is connected a condenser 39. The plate current supplied to tubes from the positive B supply terminals will traverse the resistance '38 and thereby produce a potential difference across the terminals of that element. It is therefore seen that conductor 25 is the most negative conductor of the system and may provide a C biasing potential for tubes of the receiving system which have their filaments connected to conductor 37.

Wound directly upon the third winding 26, is a fourth winding or coil 27, connected through conductors 28 without rectification to the filament 29 in the tube 30 of the receiving set.

A potentiometer 31 of approximately 500 ohms resistance, is connected across the coil 27 and the filament 29 of tube 30 in order to eliminate the hum occasioned by the use of alternating current and provide a connection to the filament circuit of tube 30.

A resistance 32 is connected between an intermediatc point on the potentiometer 31 and the negative conductor 25. The plate ur rent supplied to the tube 30 returns to the conductor through resistance 32 and develops a potential drop across said resistance. This potential drop may be employed to bias the grid electrode of tube 30.

Thus it will be seen that I have provided a relatively simple and practical system that will eliminate the use of batteries in radio receiving sets and which will also eliminate the objectionable noises that ordinarily accompany the use of alternating current in the operation of receiving sets and said apparatus being very compact and entirely devoid of special parts and fittings.

lVhile I have illustrated and described my improved system as being especially designed for use in connection with radio receiving sets, sald system may be advantageously employed wherever it is desired to transform alternating current into direct current and particularly where current voltage having sufiicient or relatively high degree of amperage is desired.

IVhile I have shown and described the preferred embodiment of my invention, it will be understood that the particular arrangement and connections herein described may be varied in minor details without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. Means for energizing a receiving set from a source of alternating current comprising a transformer having a primary winding and a plurality of secondary windings, a rectifying tube energized from said transformer and a filter network connected to the output of said tube, said filter network having maximum and intermediate positive output terminals and a negative output terminal, means for producing a grid biasing potential for certain of the tubes of the receiving set comprising a resistance device connected between a fourth utput terminal and said negative output terminal and adapted to carry the current delivered to said tubes from said maximum and intermediate positive output terminals, means for energizing the filament of at least one of the tubes of the receiving set with alternating current derived from one of the transformer secondary windings, a resistance connected in shunt with said secondary winding, means for producing a grid biasing potential for said last tube comprising a resistance connected between a point on said shunt resistance and the negative output terminal of the filter network and adapted to carry the plate current of said last tube, whereby different grid biasing potentials for said first tubes and said last tube may be obtained from a common terminal.

2. Means for energizing a receiving set from a source of alternating current comprising a transformer having a primary winding and a plurality of secondary windings, a rectifying element and a filter network connected to one of said secondary windings for producing space current for tubes in the receiving set, said filter network having positive and negative output terminals, means for producing a biasing potential for the grid of at least one of the tubes of the receiving set comprising a resistance device adapted to be connected between the cathode of said tube and said negative output terminal and adapted to carry the space current of said tube, means for energizing the cathode of another tube of said receiving set from said transformer, and means for producing a biasing potential for the grid of said last tube comprising a second resistance device connected between the cathode of said last tube and the negative output terminal of the filter network and adapted to carry the plate current of said last tube whereby difierent grid biasing potentials for said first and last tubes may be obtained from a common terminal and whereby variations in the space current of one of said tubes does not vary the grid potential of the other of said tubes.

In testimony whereof I aflix my signature.

HENRI S. on A USSENE. 

